JP2008143759A - High strength grout - Google Patents
High strength grout Download PDFInfo
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- JP2008143759A JP2008143759A JP2006335630A JP2006335630A JP2008143759A JP 2008143759 A JP2008143759 A JP 2008143759A JP 2006335630 A JP2006335630 A JP 2006335630A JP 2006335630 A JP2006335630 A JP 2006335630A JP 2008143759 A JP2008143759 A JP 2008143759A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0094—Agents for altering or buffering the pH; Ingredients characterised by their pH
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
本発明は、高い流動性および強度発現性をグラウトに付与するためのグラウト用混和材、および該混和材を含むグラウト材に関する。 The present invention relates to a grout admixture for imparting high fluidity and strength development to a grout, and a grout material containing the admixture.
グラウト材とは、地盤、構造物周辺、部材間の隙間や継目、補強鋼材のまわりの狭い間隙や空洞部を止水、補強、鋼材保護、安定化などの目的のために充填する、流動性のよい充填材料である。
グラウト材の性能としては、「強度発現性」が求められるとともに、隙間をあけずに空間を充填できるために、及び良好な作業性（ポンプ圧送性）のために、「高い流動性」が要求され、ポンプ圧送時の閉塞防止や充填後の安定した強度発現のために、「混練水がブリーディングしないこと」、「細骨材が分離しないこと」が求められる。
これらの性能を満たすものとして、セメント、シリカフュームを代表とするポゾラン物質、細骨材およびポリカルボン酸系等の減水剤を配合したグラウト材（例えば特許文献１、特許文献２）が提案されている。
Grout material is fluidity that fills the ground, the periphery of structures, gaps and joints between members, and narrow gaps and cavities around reinforcing steel for water stop, reinforcement, steel protection and stabilization purposes. It is a good filling material.
As for the performance of the grout material, "high strength" is required, and "high fluidity" is required for filling the space without leaving a gap and for good workability (pump pumpability). In order to prevent clogging during pumping and to develop stable strength after filling, it is required that “the kneaded water does not bleed” and “the fine aggregate does not separate”.
As a material satisfying these performances, a grout material (for example, Patent Document 1 and Patent Document 2) in which a pozzolanic material typified by cement, silica fume, a fine aggregate, and a water reducing agent such as a polycarboxylic acid type has been proposed. .
しかしながら、一般的なシリカフューム、すなわちセメント業界で使用されるシリカフュームの約９割を占めるフェロシリコン起源のシリカフュームは、多量の未燃カーボンを含むため、未燃カーボンが減水剤成分を吸着し、減水剤の効果が大きく低下する。しかし、上記従来技術のような比較的多い減水剤量、あるいはさらに過剰の減水剤量を使用した場合、グラウト材中の混練水のブリーディング、セメントペースト分と骨材の材料分離が生じる恐れがある。また、フェロシリコン起源のシリカフュームは、粒子径が小さく、比表面積が大きいため、これを使用する場合グラウト材の流動性確保のために比較的多量の水の添加が必要となり有効な強度発現ができなくなる。さらに、一般的に使用されるシリカフュームは、通常、水中でのｐＨが高いため、凝集して二次粒子を生成し、やはりグラウト材の流動性は低下する。
従って、一般的に使用されるフェロシリコン起源のシリカフュームでは、高い流動性の高強度グラウト材を得ることは容易ではない。
また、一般的なグラウトの混練には、コンクリートミキサーよりもトルクの小さいハンドミキサーやグラウトミキサーが使用され、簡便な装置による容易な混練性が要望される。しかしながら、特許文献１のグラウト材は混練性が不十分なためか、その製造においてコンクリートミキサーを使用することが記載されている。
However, since silica fume derived from ferrosilicon, which accounts for about 90% of the silica fume used in the cement industry, contains a large amount of unburned carbon, the unburned carbon absorbs the water reducing agent component, and the water reducing agent The effect is greatly reduced. However, if a relatively large amount of water reducing agent as in the above prior art or a further excessive amount of water reducing agent is used, bleeding of kneaded water in the grout material, separation of cement paste and aggregate material may occur. . In addition, since silica fume derived from ferrosilicon has a small particle size and a large specific surface area, when it is used, a relatively large amount of water needs to be added to ensure the fluidity of the grout material, and effective strength can be expressed. Disappear. Furthermore, generally used silica fume usually has a high pH in water, and thus aggregates to produce secondary particles, and the fluidity of the grout material also decreases.
Therefore, it is not easy to obtain a high strength grout material having high fluidity with silica fume derived from ferrosilicon which is generally used.
Further, in general kneading of a grout, a hand mixer or a grout mixer having a torque smaller than that of a concrete mixer is used, and easy kneading with a simple apparatus is desired. However, it is described that the grout material of Patent Document 1 uses a concrete mixer in the production thereof because of insufficient kneadability.
本発明は、減水剤添加量が低くても、高い流動性と良好な強度発現性を兼ね備え、かつ簡便な装置による容易な混練性を有するグラウト材を提供することを目的とする。 An object of the present invention is to provide a grout material that has both high fluidity and good strength development and has easy kneading properties with a simple device even when the amount of water reducing agent added is low.
本発明者らが鋭意検討した結果、未燃カーボン含有量（９５０℃での強熱減量）が少なく、特定範囲のｐＨ、粒子径を有するシリカフュームを用いることで、減水剤添加量が低くても高い流動性であり、良好な強度発現性のグラウト材が得られることを見出し、本発明を完成した。
すなわち、本発明は
（１）セメント１００重量部と、下記（ａ）〜（ｄ）の性状を有するシリカフュームを１５〜５０重量部、細骨材０〜２００重量部、減水剤０．１〜０．８重量部、および水を含有する高強度グラウト材；
（ａ）平均粒子径が０．５〜２．０μｍ
（ｂ）ＢＥＴ法比表面積が２〜１５ｍ2／ｇ
（ｃ）９５０℃での強熱減量が１．０重量％以下
（ｄ）６０％水スラリーの２０℃でのｐＨが２．５〜７．０
（２）水／セメント比が２０〜４０重量％である（１）の高強度グラウト材；
を提供する。
As a result of intensive studies by the present inventors, it is possible to use silica fume having a low unburned carbon content (loss at ignition at 950 ° C.) and having a specific range of pH and particle diameter, so that the amount of water reducing agent added is low. It was found that a grout material having high fluidity and good strength was obtained, and the present invention was completed.
That is, the present invention includes (1) 100 parts by weight of cement, 15 to 50 parts by weight of silica fume having the following properties (a) to (d), 0 to 200 parts by weight of fine aggregate, and 0.1 to 0 of a water reducing agent. A high strength grout material containing 8 parts by weight and water;
(A) Average particle diameter is 0.5 to 2.0 μm
(B) BET method specific surface area of 2 to 15 m 2 / g
(C) Loss on ignition at 950 ° C. is 1.0% by weight or less (d) pH of 20% water slurry at 20 ° C. is 2.5 to 7.0
(2) The high-strength grout material according to (1) having a water / cement ratio of 20 to 40% by weight;
I will provide a.
本発明で使用するシリカフュームは、未燃カーボン含有量（９５０℃での強熱減量）が少なく、ｐＨ、粒子径が特定の範囲内にあるため、減水剤の効果が発現しやすく、分散性に優れ、減水剤添加量が低くても高い流動性（すぐれた充填性、作業性）が確保でき、良好な強度発現性を有するグラウト材を与える。また、本発明の高強度グラウト材は、混練性が大幅に改善され、ハンドミキサーやグラウトミキサーを利用しても十分に混練が可能である。 The silica fume used in the present invention has a low unburned carbon content (loss at ignition at 950 ° C.), pH and particle size within a specific range, so that the effect of a water reducing agent is easily exhibited and dispersibility is improved. Even if the amount of the water reducing agent added is low, high fluidity (excellent filling property and workability) can be ensured, and a grout material having good strength development is provided. Further, the kneadability of the high-strength grout material of the present invention is greatly improved, and it can be sufficiently kneaded even by using a hand mixer or a grout mixer.
以下、本発明を詳細に説明する。
本発明で使用するシリカフュームは、（ａ）平均粒子径が０．５〜２．０μｍ；（ｂ）ＢＥＴ法比表面積が２〜１５ｍ2／ｇ；（ｃ）９５０℃での強熱減量が１．０重量％以下；（ｄ）６０％水スラリーの２０℃でのｐＨが２．５〜７．０という性状を有する。
Hereinafter, the present invention will be described in detail.
The silica fume used in the present invention has (a) an average particle size of 0.5 to 2.0 μm; (b) a BET method specific surface area of 2 to 15 m 2 / g; (c) an ignition loss at 950 ° C. of 1; 0.0% by weight or less; (d) 60% water slurry has a property that pH at 20 ° C. is 2.5 to 7.0.
本発明で使用するシリカフュームの（ａ）平均粒子径は０．５〜２．０μｍであり、より好ましくは０．７〜１．５μｍである。平均粒子径が０．５μｍ以下であると流動性が低下し、充填性、作業性の確保が困難であり、２．０μｍ以上であるとブリーディング、材料分離の発生、または、反応性、硬化体の緻密性（マイクロフィラー効果）の面で充分な強度発現を得ることが困難である。
また、本発明で使用するシリカフュームの（ｂ）ＢＥＴ法による比表面積は２〜１５ｍ2／ｇであり、より好ましくは７〜１２ｍ2／ｇである。ＢＥＴ比表面積が２ｍ2／ｇ以下であるとブリーディング、材料分離の発生、または、反応性、硬化体の緻密性（マイクロフィラー効果）の面で充分な強度発現を得ることが困難であり、１５ｍ2／ｇ以上であると流動性が低下し、充填性、作業性の確保が困難である。
The average particle diameter of (a) silica fume used in the present invention is 0.5 to 2.0 μm, more preferably 0.7 to 1.5 μm. If the average particle size is 0.5 μm or less, the fluidity is lowered, and it is difficult to ensure filling properties and workability. If the average particle size is 2.0 μm or more, bleeding, occurrence of material separation, or reactivity, a cured product is obtained. It is difficult to obtain sufficient strength in terms of the denseness (microfiller effect).
Moreover, the specific surface area by the (b) BET method of the silica fume used by this invention is 2-15 m < 2 > / g, More preferably, it is 7-12 m < 2 > / g. When the BET specific surface area is 2 m 2 / g or less, it is difficult to obtain sufficient strength in terms of bleeding, material separation, or reactivity and the compactness of the cured product (microfiller effect). If it is 2 / g or more, the fluidity is lowered, and it is difficult to ensure filling property and workability.
本発明で使用するシリカフュームの（ｃ）９５０℃での強熱減量（未燃カーボン含有量）は１．０重量％以下であり、より好ましくは０.５重量％以下である。９５０℃での強熱減量（未燃カーボン含有量）が１．０重量％以下であると、減水剤成分が未燃カーボンに吸着されることが抑制できる。従って、減水剤の効果が十分に発現され、減水剤添加量が少ない配合であってもセメント粒子やシリカフュームの分散性が良好となり、グラウト材の流動性や強度発現性が良好となる。 The silica fume used in the present invention has (c) ignition loss (unburned carbon content) at 950 ° C. of 1.0% by weight or less, more preferably 0.5% by weight or less. When the ignition loss (unburned carbon content) at 950 ° C. is 1.0% by weight or less, the water reducing agent component can be suppressed from being adsorbed on the unburned carbon. Accordingly, the effect of the water reducing agent is sufficiently exhibited, and even with a formulation with a small amount of the water reducing agent added, the dispersibility of the cement particles and silica fume is improved, and the fluidity and strength expression of the grout material are improved.
本発明で使用するシリカフュームの（ｄ）６０％水スラリーの２０℃でのｐＨは２．５〜７．０であり、より好ましくは３．０〜５．０である。該ｐＨが２．５以下であると予めセメントと混合した場合の安定性が低下し、該ｐＨが７．０以上であると粒子が凝集し、２次粒子を形成しやすくなることで、シリカフュームの分散性の悪化によりグラウト材の流動性の低下が発生する。 The pH at 20 ° C. of the (d) 60% water slurry of silica fume used in the present invention is 2.5 to 7.0, more preferably 3.0 to 5.0. When the pH is 2.5 or less, the stability when pre-mixed with cement is lowered, and when the pH is 7.0 or more, the particles are aggregated and secondary particles are easily formed. The fluidity of the grout material is lowered due to the deterioration of the dispersibility.
本発明で使用するシリカフュームは、上記（ａ）〜（ｄ）の性状を満足するものであれば製法や原料物質等は特に限定されないが、通常、ジルコニア製造時の副産物であるシリカフュームにおいて、かかる性状を満たすものを見出しやすい。よって、主としてジルコニア起源のシリカフュームのバッチから（ａ）〜（ｄ）の性状を満足するものを選別して本発明のグラウト材に使用するのが好ましい。 The silica fume used in the present invention is not particularly limited as long as it satisfies the properties (a) to (d) described above, but the production method and raw material are not particularly limited. It is easy to find what meets the requirements. Therefore, it is preferable to select from the batches of silica fume mainly derived from zirconia and satisfy the properties (a) to (d) and use them in the grout material of the present invention.
上記シリカフュームのグラウト材への配合量は、グラウト材に要求されるワーカビリティー、強度、耐久性などの所望の性能を付与する量であり、セメント１００重量部に対し、１５〜５０重量部含有させる。配合量が１５重量部未満では増粘作用の低下のためにブリーディング、細骨材の分離が起こり、配合量が５０重量部を超えるとグラウト材の流動性が低下する。 The amount of silica fume added to the grout material is an amount that imparts desired performance such as workability, strength, and durability required for the grout material, and is contained in an amount of 15 to 50 parts by weight with respect to 100 parts by weight of cement. If the blending amount is less than 15 parts by weight, bleeding and fine aggregate are separated due to a decrease in the thickening action, and if the blending amount exceeds 50 parts by weight, the fluidity of the grout material decreases.
本発明で使用するセメントは、特に限定されず、いずれのセメントも使用することができる。例えば、普通、中庸熱、低熱、早強、超早強、耐硫酸塩など各種ポルトランドセメント、高炉セメントやフライアッシュセメントおよびシリカセメントなどの混合セメント、アルミナセメントやジェットセメントなどの超速硬セメント、アーウィン系セメントなどが挙げられる。 The cement used in the present invention is not particularly limited, and any cement can be used. For example, normal, moderate heat, low heat, early strength, super early strength, various portland cements such as sulfate-resistant, mixed cements such as blast furnace cement, fly ash cement and silica cement, ultrafast cements such as alumina cement and jet cement, Irwin Based cement.
本発明のグラウト材は、セメント、上記シリカフュームのほか、細骨材、減水剤、水および必要に応じ、膨張材、消泡剤、発泡剤などを含有する。
細骨材としては、粒径５．０ｍｍ以下の川砂、陸砂、海砂、砕砂、珪砂、スラグ骨材などが使用でき、セメント１００重量部に対して０〜２００重量部配合され、より好ましくは、５０〜１５０重量部である。該細骨材量が２００重量部を超えるとセメント量、シリカヒューム量が低下することとなり、安定的な高流動性、高強度が得られない。
The grout material of the present invention contains cement, the above silica fume, fine aggregate, water reducing agent, water, and, if necessary, an expansion material, an antifoaming agent, a foaming agent and the like.
As the fine aggregate, river sand, land sand, sea sand, crushed sand, silica sand, slag aggregate, etc. having a particle size of 5.0 mm or less can be used, and 0 to 200 parts by weight is preferably blended with respect to 100 parts by weight of cement. Is 50 to 150 parts by weight. If the amount of fine aggregate exceeds 200 parts by weight, the amount of cement and the amount of silica fume will decrease, and stable high fluidity and high strength cannot be obtained.
減水剤としては、公知の高性能減水剤、ＡＥ減水剤、高性能ＡＥ減水剤等が使用できるが、高強度のグラウトを得るためには、高性能ＡＥ減水剤を使用することが好ましい。減水剤の添加量はセメント１００重量部に対して０．１〜０．８重量部であり、より好ましくは、０．２〜０．６重量部である。該減水剤添加量が０．１重量部以下であると良好な流動性を得ることができず、０．８重量部を超えるとブリーディング、あるいは細骨材の分離が発生する。 As the water reducing agent, known high performance water reducing agents, AE water reducing agents, high performance AE water reducing agents and the like can be used, but in order to obtain a high strength grout, it is preferable to use a high performance AE water reducing agent. The addition amount of the water reducing agent is 0.1 to 0.8 parts by weight, more preferably 0.2 to 0.6 parts by weight with respect to 100 parts by weight of cement. When the amount of the water reducing agent added is 0.1 parts by weight or less, good fluidity cannot be obtained, and when it exceeds 0.8 parts by weight, bleeding or fine aggregate separation occurs.
本発明のグラウト材において、水は、水／セメント比２０〜４０重量％で添加される。 In the grout material of the present invention, water is added at a water / cement ratio of 20-40% by weight.
膨張材、消泡剤、発泡剤などは公知の材料、薬剤が特に制限なく使用できる。 A well-known material and a chemical | medical agent can be especially used for an expansion | swelling material, an antifoamer, a foaming agent, etc. without a restriction | limiting.
以下に本発明の実施例を挙げ、さらに詳しく本発明を説明する。 Examples of the present invention will be given below to explain the present invention in more detail.
実施例
（使用原材料）
セメント：早強ポルトランドセメント（住友大阪セメント（株））
シリカフュームＡ：ＳＦシリカフューム（巴工業（株））
シリカフュームＢ：９００Ｗ（エルケム・ジャパン（株））
シリカフュームＣ：ＥＦＡＣＯ（巴工業（株））
シリカフュームＤ：９４０Ｕ（エルケム・ジャパン（株））
細骨材：３号珪砂と５号珪砂とを重量比１：１で混合したもの
水：上水道水
減水剤：マイティ２１P（花王（株））
Example (Raw materials used)
Cement: Hayashi Portland Cement (Sumitomo Osaka Cement Co., Ltd.)
Silica fume A: SF silica fume (Sakai Industry Co., Ltd.)
Silica fume B: 900W (Elchem Japan Co., Ltd.)
Silica fume C: EFACO (Sakai Industry Co., Ltd.)
Silica fume D: 940U (Elchem Japan Co., Ltd.)
Fine aggregate: A mixture of No. 3 silica sand and No. 5 silica sand in a weight ratio of 1: 1 Water: Water tap water reducing agent: Mighty 21P (Kao Corporation)
使用したシリカフュームＡ〜Ｄの性状を表１に示す。
強熱減量はＪＩＳ Ａ６２０１「コンクリート用フライアッシュ」に準じて９５０℃で測定し、未燃カーボン量の指標とした。平均粒子径はレーザー回析式粒度分布計によって測定した。ＢＥＴ比表面積は、「窒素吸着法」によって測定した。また、６０％水スラリーの２０℃でのｐＨはＪＩＳ Ｚ ８８０２−１９８６「ｐＨ測定法」に基づいて測定した。
Table 1 shows the properties of the silica fumes A to D used.
The ignition loss was measured at 950 ° C. according to JIS A6201 “Fly Ash for Concrete” and used as an index of the amount of unburned carbon. The average particle size was measured with a laser diffraction particle size distribution meter. The BET specific surface area was measured by the “nitrogen adsorption method”. The pH of the 60% water slurry at 20 ° C. was measured based on JIS Z 8802-1986 “pH measurement method”.
表１より、シリカフュームＡは、強熱減量（未燃カーボン含有量）が極めて小さく、ｐＨも他のシリカフュームに比べて低い。シリカフュームＢは、強熱減量は小さいがｐＨが高く、シリカフュームＣは、ｐＨは低いが強熱減量が大きい。また、シリカフュームＤは強熱減量、平均粒子径、ＢＥＴ比表面積、ｐＨのいずれもが本発明の範囲外である。 From Table 1, silica fume A has a very low ignition loss (unburned carbon content), and pH is also lower than other silica fume. Silica fume B has low ignition loss but high pH, and silica fume C has low pH but high ignition loss. Silica fume D is not within the scope of the present invention in terms of loss on ignition, average particle diameter, BET specific surface area, and pH.
（配合試験）
表２の配合比（重量部）でセメント、シリカフューム、細骨材、減水剤を混合し、適量の消泡剤、発泡剤などをプレミックスした粉体を水に投入後、ハンドミキサーを使用し混練を行った。
(Combination test)
Cement, silica fume, fine aggregate, water reducing agent are mixed in the mixing ratio (parts by weight) shown in Table 2, and a premixed powder of an appropriate amount of antifoaming agent, foaming agent, etc. is added to water, and then a hand mixer is used. Kneading was performed.
得られた混練物であるグラウト材の流動性、ブリーディング、細骨材の分離状況を評価した。ブリーディングは、ＪＳＣＥ−Ｆ５３２「ＰＣグラウトのブリーディング率および膨張率測定方法」に準拠し、打設後３時間でのブリーディング率を測定した。流動性は、ＪＳＣＥ−Ｆ５３１「ＰＣグラウトの流動性試験方法」に準拠し、Ｊ１４流下時間を測定した。Ｊ１４流下時間が「５〜１５秒」であれば高流動性のグラウト材であり、すぐれた充填性、作業性のグラウト材となる。
細骨材の分離状況は、混練終了１０分後の細骨材分離の有無を指触観察した。
また、得られた混練物からφ５０ｍｍ×１００ｍｍの圧縮強度測定用円柱供試体を作製した。円柱供試体は材齢１日で脱型し、２０℃で封緘養生し、材齢２８日でＪＩＳ Ａ １１０８に準じた圧縮強度試験を実施した。
これらの試験結果を表２に示す。
The flowability, bleeding, and separation of fine aggregates of the grout material that was the kneaded product were evaluated. The bleeding was measured according to JSCE-F532 “PC Grouting Bleeding Rate and Expansion Method” after 3 hours from casting. The fluidity was measured in accordance with JSCE-F531, “PC grout fluidity test method”, and the J14 flow time was measured. If the J14 flow-down time is “5 to 15 seconds”, it is a highly fluid grout material and a grout material with excellent filling properties and workability.
As for the fine aggregate separation state, the presence or absence of fine aggregate separation 10 minutes after the end of kneading was observed by finger touch.
In addition, a cylindrical specimen for measuring compressive strength of φ50 mm × 100 mm was prepared from the obtained kneaded material. The cylindrical specimen was demolded at a material age of 1 day, sealed at 20 ° C., and subjected to a compressive strength test in accordance with JIS A 1108 at a material age of 28 days.
These test results are shown in Table 2.
表２に示すように、シリカフュームＡを配合した実施例１〜３は、Ｊ１４流下時間が８〜１４秒であり、高流動性のグラウト材が得られ、ブリーディング、細骨材の分離はなく、材齢２８日における圧縮強度も高強度であった。
しかしながら、シリカフュームＡの配合量が本発明で規定する量より少ない比較例４では細骨材が分離し、規定量より多い比較例５では、Ｊ１４流下時間が１５秒を超え、高流動性とはいい難いものであった。
As shown in Table 2, Examples 1 to 3 blended with silica fume A had a J14 flow time of 8 to 14 seconds, a highly fluid grout material was obtained, and there was no separation of bleeding and fine aggregate, The compressive strength at the age of 28 days was also high.
However, in Comparative Example 4 in which the blending amount of silica fume A is less than the amount specified in the present invention, fine aggregate is separated, and in Comparative Example 5 in which the amount is more than the specified amount, J14 flow time exceeds 15 seconds, and high fluidity is It was a difficult thing.
一方、シリカフュームＢ，Ｃ，Ｄを配合した比較例１〜３、比較例６〜８では、Ｊ１４流下時間が長く、流動性に大きく劣り、圧縮強度も若干低めであった。 On the other hand, in Comparative Examples 1 to 3 and Comparative Examples 6 to 8 in which silica fumes B, C, and D were blended, the J14 flow time was long, the fluidity was greatly inferior, and the compressive strength was slightly low.
以上のように強熱減量（未燃カーボン含有量）が１．０重量％以下で、ｐＨが２．５〜７．０であり、所定の粒径、比表面積であるシリカフュームを所定量配合したグラウト材は高流動性であり、強度発現性にもすぐれることが分る。 As described above, a predetermined amount of silica fume having a loss on ignition (unburned carbon content) of 1.0% by weight or less, a pH of 2.5 to 7.0, and a predetermined particle size and specific surface area was blended. It can be seen that the grout material has high fluidity and excellent strength development.
Claims (2)
（ａ）平均粒子径が０．５〜２．０μｍ
（ｂ）ＢＥＴ法比表面積が２〜１５ｍ2／ｇ
（ｃ）９５０℃での強熱減量が１．０重量％以下
（ｄ）６０％水スラリーの２０℃でのｐＨが２．５〜７．０ 100 parts by weight of cement, 15 to 50 parts by weight of silica fume having the following properties (a) to (d), 0 to 200 parts by weight of fine aggregate, 0.1 to 0.8 parts by weight of water reducing agent, and water Contains high-strength grout material.
(A) Average particle diameter is 0.5 to 2.0 μm
(B) BET method specific surface area of 2 to 15 m 2 / g
(C) Loss on ignition at 950 ° C. is 1.0% by weight or less (d) pH of 20% water slurry at 20 ° C. is 2.5 to 7.0
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| JP2010155642A (en) * | 2008-12-27 | 2010-07-15 | Taiheiyo Materials Corp | Cement composition and prolonged storage method thereof |
| JP2010155871A (en) * | 2008-12-26 | 2010-07-15 | Denki Kagaku Kogyo Kk | Grouting material and grouting method using the same |
| WO2012108360A1 (en) * | 2011-02-08 | 2012-08-16 | 電気化学工業株式会社 | Filling material, method for producing filling material, and filling method |
| JP2017088461A (en) * | 2015-11-13 | 2017-05-25 | カニエＪａｐａｎ株式会社 | Water stop agent |
| JP2019132032A (en) * | 2018-01-31 | 2019-08-08 | 日本道路株式会社 | Cement milk solid raw material for semi-flexible pavement, cement milk for semi-flexible pavement, and semi-flexible pavement |
| CN111646758A (en) * | 2020-05-15 | 2020-09-11 | 湖南武源建材有限责任公司 | Sleeve grouting material for connecting reinforcing steel bars and preparation process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010155871A (en) * | 2008-12-26 | 2010-07-15 | Denki Kagaku Kogyo Kk | Grouting material and grouting method using the same |
| JP2010155642A (en) * | 2008-12-27 | 2010-07-15 | Taiheiyo Materials Corp | Cement composition and prolonged storage method thereof |
| WO2012108360A1 (en) * | 2011-02-08 | 2012-08-16 | 電気化学工業株式会社 | Filling material, method for producing filling material, and filling method |
| JP5956931B2 (en) * | 2011-02-08 | 2016-07-27 | デンカ株式会社 | Injection material, injection material manufacturing method, and injection method |
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| JP7178785B2 (en) | 2018-01-31 | 2022-11-28 | 日本道路株式会社 | Semi-Flexible Paving Cement Milk Solids Raw Material, Semi-Flexible Paving Cement Milk and Semi-Flexible Pavement |
| CN111646758A (en) * | 2020-05-15 | 2020-09-11 | 湖南武源建材有限责任公司 | Sleeve grouting material for connecting reinforcing steel bars and preparation process thereof |
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